Minor

BUILD.md

-On Linux, install the development packages for
-[FreeType](http://www.freedesktop.org/wiki/Software/FreeType/),
+On Linux, install the development packages for FreeType,
 Cairo, and GLib. For example, on Ubuntu / Debian, you would do:
 * sudo apt-get install gcc g++ libfreetype6-dev libglib2.0-dev libcairo2-dev
 
@@ -30,4 +29,8 @@ on the Mac, using MacPorts:
 * sudo port install autoconf automake libtool pkgconfig ragel gtk-doc
 
 or using Homebrew:
-* brew port install autoconf automake libtool pkgconfig ragel gtk-doc
+* brew install autoconf automake libtool pkgconfig ragel gtk-doc
+
+To build the Python bindings, you also need:
+
+* brew install pygobject3